Frontiers of Chemical Science and Engineering
>> 2020,
Volume 14,
Issue 6
doi:
10.1007/s11705-019-1912-2
RESEARCH ARTICLE
Selective hydrogenation of acetylene over Pd/CeO
Department of Chemistry, Texas A&M University Commerce, PO Box 3011, Commerce, TX 75429, USA
Accepted: 2020-03-20
Available online: 2020-03-20
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Abstract
Five hundred ppm Pd/CeO catalyst was prepared and evaluated in selective hydrogenation of acetylene in large excess of ethylene since ceria has been recently found to be a reasonable stand-alone catalyst for this reaction. Pd/CeO catalyst could be activated by the feed gas during reactions and the catalyst without reduction showed much better ethylene selectivity than the reduced one in the high temperature range due to the formation of oxygen vacancies by reduction. Excellent ethylene selectivity of ~100% was obtained in the whole reaction temperature range of 50°C–200°C for samples calcined at temperatures of 600°C and 800°C. This could be ascribed to the formation of Pd Ce O or Pd-O-Ce surface species based on the X-ray diffraction and X-ray photoelectron spectroscopy results, indicating the strong interaction between palladium and ceria.
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